restriction site restriction nuclease • restrictionary · · · Info · Definitions · Characters · · restriction site · · Text Common · · Latin · · Scripts 16 · · Length 4 · · Syllables Definitions · · · (noun) the specific sites at which a restriction enzyme will cleave DNA. Synonyms: restriction site. · · Noun Definition 1 Characters · · space U+0020 c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074